Question: Selection of components for the demister in the esterification reactor

To resist acid corrosion, and considering the adverse effect of molybdenum on the esterification reaction in ultra-low carbon molybdenum-nickel-chromium steels (such as 0Cr18Ni12Mo3Ti, etc.), Cr18Ni9Ti was chosen as the material.

Regarding the demisters for esterification reactors catalyzed by sulfuric acid, there are traditional mesh-type and filter-screen type demisters that use pore structures for interception and blocking, as well as high-efficiency dynamic separation devices such as vane-type separators for efficient gas-liquid separation and demisting. By adopting high-efficiency vane-type gas-liquid demisting and defoaming separators to upgrade the technology and replace traditional mesh demisters, it is possible to improve the efficiency of demisting and separation, reduce the size and cost of the equipment, as well as lower operating costs and pressure drops, thereby making the process technology more optimal and cost-effective. Currently, demisters both domestically and internationally are increasingly adopting feather-leaf type high-efficiency dynamic gas-liquid demisting and defogging separation internals to replace traditional mesh-type and filter-type demisting internals. The main reason is that traditional screen-type and filter-type demisting internals separate liquid droplets in the gas phase by intercepting them through the pores formed within these internals; the structure of these internals determines the separation mechanism, which in turn affects their operational performance. Firstly, the pore sizes of mesh-type and filter-type demister internals follow a **highly concentrated Gaussian distribution. While the small pore sizes enable the interception of small liquid droplets, larger droplets can pass through the larger pores; therefore, traditional mesh-type and filter-type demisters are unable to achieve efficient and precise separation. Secondly, the wire mesh type demisting internals used in sulfuric acid recovery systems have fine metal wires that can easily corrode and break down rapidly in acidic solutions; this not only leads to a further decline in separation efficiency but also, on an industrial scale, causes the small fragments of the mesh present in the liquid to cause fatal damage to the circulation pumps. Third, conventional screen-type and filter-type demisting separators have a relatively low separation efficiency due to their structural design; this requires a much larger internal flow area to compensate, which in turn necessitates a larger-sized housing, increasing the cost of the equipment. High-efficiency gas-liquid separators such as the feather-leaf type high-efficiency gas-liquid demisting and defoaming separator, as well as the multi-factor swirl parent-child separator, overcome the serious technical and economic shortcomings of traditional demisters. They offer advantages such as high-efficient and precise separation, high separation efficiency, stable operation, small equipment size, an extremely long service life for their internal components, and simple operation and maintenance at very low costs. For more technical information on it, please visit the direct link http://bbs.hcbbs.com/thread-1354814-1-1.html on this HBC Chemicals forum. For further technical solutions, please contact professional separation technology companies for collaboration.